Developing a Spatially Enabled Inventory of Recreational Boats Using Vessel Registration Data

Effective waterway management requires information on the characteristics and locations of boats. A field-based boat census—a traditional method to obtain spatially accurate information—is relatively expensive, time-consuming, and restrictive in scope. Vessel registration data, maintained by all U.S. states, is potentially a more robust information source. This research evaluated the accuracy and reliability of vessel registration data to supply location and attribute information for boats. The study premise was to use vessel registration data, which includes the mailing address of registered boat owners, to develop a spatially enabled inventory of boats. The study area comprised 12,064 salt-water accessible property parcels in two Florida counties. An on-water census (OWC) provided location and characteristics for 5,023 vessels, which were compared to 8,681 vessel registration records linked to the study area. Discrepancies between the OWC and vessel registration data were explained by a stratified, random sample of 485 telephone survey respondents. Study results show that vessel registration data accurately located and characterized roughly 81% of the boat population; in contrast, the OWC accurately located less than 56%. A conclusion is that state vessel registration data is a better alternative than an OWC for locating and characterizing boats kept along waterways.     

European Tunnelling Review Quality, Environment and Safety Focus

This paper provides an overview of tunnelling projects with some of the themes covered by the Chengdu Tunnelling Conference.(a) Environmental issues and tunnels under high groundwater pressure (Hallandsis Rail Tunnel, Sweden)(b) Fire -fighting and tunnel safety on long highway tunnels (Socatop Tunnel, West Paris)(c) Mechanised tunnelling below the world's largest airport (Heathrow T5) of a quality that avoids disruption to its operation.Each of these overviews show an enhanced performance in regard to project specific events or objectives. Particularly in tunnelling, project owners expect more than just a facility delivered on time for their money: they expect an all round performance respecting deadlines, budget, environmental protection, safety, quality and community harmony. Funding agencies do not always have the same agenda as project owners, acknowledging peripheral selection criteria but often demanding that the lowest bidder be awarded work. All round performance requires all round project selection criteria.     

印象和现实

集装箱码头可以提高他们的能力 运输业对西海岸港口的第一印象是这些港口太拥挤了.但是,这种印象是错误的,至少在短期内是错误的.     

车辆/轨道相互作用的识别

某些类型的车辆对轨道几何形状的变化特别敏感。神经网络系统是一种具有潜力的更为精确的测试方法。本文介绍了神经网络在轨道／车辆模型检测中的开发与应用。     

2007全球十佳发动机(上)

从“Ward＇s AutoWorld”杂志评选的全球十佳发动机可以看到，汽车整车以及动力系统带着巨大的跃变进入到了2007年。[编者按]     

Delivering Value for Money to Government through Efficient and Effective Public Transit Service Continuity: Some Thoughts

Abstract

This paper documents some thoughts on the reform agenda in public transit that is occurring throughout the world. The specific focus is on a growing commitment to competitive regulation through competitive tendering, and the efforts by a few governments (notably in Australia) to take control of the tangible assets used by private operators as a mechanism to exercise the opportunity, if so taken, to put services out to competitive tender. The paper reviews the theoretical arguments and empirical evidence on contracting regimes and asset ownership, and the role that government and the operator might play in a setting in which building trusting and collaborative partnerships has merit in delivering services that are in the main funded from the public purse.     

水与火

港口拥堵和工人罢工拖累美国西海岸集装箱吞吐量,而东海岸和墨西哥湾港口箱量则大幅提升。来自美国太平洋海事协会的数据显示,由于美国西海岸港口异常拥堵,国际码头仓储工人联盟消极怠工,去年12月集装箱吞吐量下降6%,2014年全年增长率微乎其微,几乎不到1%。上述数据公布在太平洋海事协会网站上,显示去年12月所有主要港口吞吐量均出现同比下滑,包括洛杉矶—长滩、奥克兰、波特兰和西雅图—塔科     

为绿而生——“天使投资人”为港口环境技术提供所震资金

对于拥有“绿色”供应链技术的企业来说，这是一个伟大的时代。公有和私营机构能够通过赠与、贷款或其它形式的资助获得将研发成果投入商用生产所需的数亿元资金。 在南加利福尼亚，为了货物运输的创新型解决方案，位于海港区的各港口、学校、投资者和运输公司共同协作组成技术集群。     

CBTC转换战略的实施

引进各种新信号技术系统是复杂而有风险的。美国运输技术中心公司（TTCI）认为逐步转换能使进程顺利并最大限度地提高可靠性。     

签约旺季

费率降低、运费的不确定性对托运人和承运人来说都是危险的事情。Dave Akers先生每天到达办公室后的第一件事就是查看从亚洲到美国集装箱航线的即期运费。作为玩具托运人协会的执行董事，Dave Akers打算在未来几个月里都保持这种警觉状态。